public class Main {
    public static void main(String[] args) {
        //System.out.println("Hello world");
        System.out.println(Integer.MAX_VALUE);//int 最小值
        System.out.println(Integer.MIN_VALUE);//int 最大值
        //long a = 10L;//定义一个长整型变量，注意值后要加上一个l，大小写都可以
        //double b = 1.0;//双精度浮点型定义
        //System.out.println(b);
        char ch = '哦';//定义一个字符变量
        System.out.println(ch);
        String name = "zhang san";
        System.out.println(name);
        //String a = "hello";
        //String b = "world";
        //System.out.println(a + b);
        int a = 10;
        String b = "a = ";
        System.out.println(b + a);
    }
}